make IP to ping configurable

ffs-updatetest.py

@@ -17,6 +17,7 @@ ap.add_argument("--updatecount", help="Number of updates to perform", default=10
 ap.add_argument("--debug", help="Enable debugging output", action="store_true")
 ap.add_argument("--before-version", help="Version expected running before update", default="2.0+2020-09-26-g.8547bd43-s.f16f34e")
 ap.add_argument("--after-version", help="Version expected running after update", default="2.1+2020-12-11-g.90d0e33c-s.de75272")
+ap.add_argument("--ping-ip", help="IP to ping to verify connectivity to GW", default="fd21:b4dc:4b00::a38:1")
 args = ap.parse_args()
 
 if args.debug:
@@ -63,7 +64,7 @@ def run_in_vm(cmd, asynchronous=False):
     return result
 
 def has_gw_connection():
-    result = run_in_vm(["ping", "-c1", "fd21:b4dc:4b00::a38:1"])
+    result = run_in_vm(["ping", "-c1", args.ping_ip])
     return result["exitcode"] == 0
 
 def wait_for_gw_connection():